Reduction-frame for lithographic work.



No. 655,302. P atented Aug. .7, 1900. r. J. KALLENBACH. REDUCTION FRAME FOR LITHOGRAPHIC WORK.

[Application filed Oct. 28. 1899.)

2Sheets-Sheet (No Model.)

k INVENTORI Wf. m4

WITNESSES:

; ATTORNEY No. 655,302. Patented Aug. 7, [9 00.-

F. J. KALLENBACH. REDUCTION FRAME FOR LITHOGBAPHIC WORK.

(Application filed Oct. 28, 1899.)

2 Sheets-Shea! 2 (No Model.)

INVENTOR ATTORNEY TNE uonms puns co. Wotan-ma. WASHINGTON, o. c.

NlTED STATES PATENT Cerise.

FERDINAND J. KALLENBACH, OF NEWV YORK, N. Y-..

REDUCTION-FRAME FOR LITHOGRAPHIC WORK.

SPECIFICATION forming part of Letters Patent No. 655,302, dated August 7, 1900.

Application filed October 28, 1899. Serial No. 735,026. (No model.) I

To all whom it may concern.-

Be it known that I, FERDINAND J. KALLEN- EACH, a citizen of the United States, residing in the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Red notion-Frames for Lithographic Work, of which the following is a specification.

This invention relates to means employed in lithographic work for reducing transfers. The known means employed for this purpose consist of a rectangular frame which may be reduced or enlarged uniformly in all directions and a transfer-sheet of very thin rubber stretched in said frame. If it be required to reduce a picture or drawing, the sheet is first stretched in the frame, the picture transferred thereto in a known way, the sheet allowed to contract until it is of the proper dimensions, and the picture transferred to the stone or plate. The measurements are made with ordinary measuring instruments.

For some classes of work, and particularly for single-color work, the above apparatus and mode of operation will suffice; but where great accuracy is required or Where a number of transfers for as many colors are to be made there are many disadvantages. It is difficult to get accurate measurements, as it it is not safe to employ dividers or other pointed instruments because of the danger of perforating the rubber film.

The object of the present invention is to provide the reduction-frame of whatever form or construction it may be with means for taking an accurate measure of the transfer and for assuring accuracy in the dimensions of all the transfers to be used in m ulticolor-work. In a general way this device consists of abar mounted on the reducing-frame and extending across and over it, said bar having proper adjustments and markers slidable along it and furnished with micrometer adjustments, so that they may be set accurately to the register-marks on the transfer.

In the accompanying drawings, which illustrate an embodiment of the invention, Figure 1 is a face view, on a small scale, of the reduction-frame and the index device mounted thereon. Fig. 2 is a plan view of the index device as a whole, and Fig. 2 is a cross-section at so in Fig. 2.

Figs. 3 and 4 are respectively sectional detail views of the hinging end of the bar and the support for the free end thereof. Fig. 5 is a side elevation of one of the markers detached. Fig. 6 is an'under side View of the same. Fig. 7 is a sectional view illustrating one means for vertically adjusting the finger, and Fig. 8 is a sectional View of the set-screw device for clamping the marker on the bar of the index device. Fig. 9 is a face view of the micrometer-adjusting device for the two intermediate markers. Fig. 10 is a view showing another means for effecting the result of the device of Fig. 7.

The reduction-frame will require but a brief description, as it is known in the art. It comprises a strong rectangular frame a, on the four sides of which are rotatively mounted as many shafts b, which are geared together at the corners by miter-gears, and one is provided with a crank 0, whereby all may be rotated in unison. These shafts have each a right-hand and a left-hand screw-thread, on which are mounted sleeve-nuts d, attached to the ends of four bars 6, which form an inner frame that may be enlarged or reduced by rotating the crank c. On eachbar e is a lazy-tongs device f, provided with numerous clips which nip the edge of the rubber transfer-film g. By first stretching the film g by means of the screws in all directions, then putting on it one or more transfers h '(indicated by rectangular spaces in dotted lines) and register-marks "i, and then slackening the tension by means of the screws the transfer may be reduced to the extent desired. It is important that this reduction shall be very accurate and that where the picture is to be printed in a number of colors the transfers for the difierent colors shall be reduced accurately to the same dimensions. ject is secured by means of the index device which forms the feature of this invention and which will now be described with especial reference to the detail views; I

1 is a bar of such length as to extend across the frame a. Preferably this bar will be of metal, rectangular-in cross-section and hollow for the sake of lightness. At one end (the left in Fig. 2 and the upper end in Fig. 1) the bar 1 is hinged on a laterally-projecting rod j from a bearing-block on the frame a. Fig.

This ob- 3 shows the hinging part in section and the partsj and k in dotted lines. At its other end, which may be called the free end, the bar 1 is provided with a sleeve 2, with a leg and foot 3 to rest on the screw 1) at that side. This feature is shown partly in section in Fig. 4, where the bar 1 is indicated in dotted lines.

On the bar are slidably mounted markers, (designated as awhole in Fig. 2 by Aand B.) In this figure and in Fig. 1 two pairs of markers are shown; but one or more pairs may be employed. In general the marker A is like the marker B; but the former is adapted merely to be adjusted and then fixed on the bar, while the latter has a micrometer adj ustment along the bar, as will be hereinafter explained. Referring especially to Figs. 5, 6, and 7, 4 is a sleeve on and adapted to slide along the bar 1 and provided with an oblique set-screw 5, Fig. 8, to bear on the corner of the bar in clamping fast. The purpose of this is to attain accuracy by drawing the several sleeves always up to one and the same angle or corner of the bar 1. Mounted in guideways 6 on the sleeve 4 is a slide 7, operated by a collared screw 8. This slide 7 moves in a path parallel with the bar 1, and it carries a guideway 9, in which plays a slide 10, the path of which is at right angles to that of the slide 7. The slide 10 is operated by a collared screw 11. Thus two delicate adjustments of the slide 10 are attained by means of the screws 8 and 11 in a plane parallel with the surface of the stretched sheet or film g.

The bar 1 is elevated somewhat above the sheet c, as indicated in Fig. 5, and mounted adj ustably in the slide 10 is an upright stem or shank 12, to which is secured a finger 13, which is nearly in contact with the sheet g. Fig. 7 shows how the shank 12 may be made adjustable longitudinally in the slide 10 and be secured firmly by a set-screw 14, which bears on a flattened face on the shank, and Fig. 10 shows a slightly-difierent fastening device for the shank. In this case a spring 22 bears on the flattened face on the shank and holds it by friction. A set-collar 23 on the shank limits the downward movement thereof.

The marker A, as before stated, is adapted only to be adjusted roughly by hand and then set on the bar 1 by the screw 5, and then the finger 13, adjusted carefully to the registermark t', as seen in Fig. 6, by the screws '8 and 11; but the marker B has another adjustment along the bar which will now be described with especial reference to Figs. 2, 2, 5, and 9.

Extending along the front of the bar 1 is an elongated plate 15, which has in it a longitudinal slot 16. A screw 17 is collared in a bracket 18 on the plate 15 and screws through a nut-bracket 19, fixed on the bar 1. By means of this screw 17 the plate 15 may be moved or adjusted micrometrically in a longitudinal direction.

On the front of the sleeve 4 of the marker B is a screw 20, which projects outward through the slot 16, and on this screw is a clamp-nut 21. By screwing up this nut 21 and slackenin g the set-screw 5 the marker B maybe micrometrically adjusted along the bar 1. of the markers B may be adjusted in'this manner, which is very desirable in some classes of work.

Either The device shown in Fig. 10 for clamping the shank 12, carrying the finger 13, and for limiting its endwise movement is that preferred. Thecollar 23 is set so as to prevent the finger from injuring the sheet g, and the spring 22 holds the stem securely against rotation and also against dropping by gravity, but allows it to be pressed down.

The part 13, called a finger, is aflat plate with a straight edge in which, near its middle, is a notch 13, which. provides an angle 2. The combination with a reduction-frame for lithographers, of a bar mounted removably on and extending across said frame, said bar having an angular cross-section, and a plurality of markers slidably mounted on said bar, each of said markers having a finger, and means for adjusting said finger microinetrically in two directions, substantially as set forth. j

3. The combination with the reductionframe and the bar 1, mounted thereon, of a marker, mounted slidably on said bar and provided with an adjustable finger 13, a'screwstud 20, and a nut 21, the slotted plate 15, hearing a collared screw 17, the stud 20 engaging said slot, and the nut 19, fixed on the bar 1, and running on said screw 17, substantially as setforth. r

4. The combination with a reduction-frame and bar for the markers, mounted on and extending across the frame, of a marker, con sisting of a sleeve which embraces said bar, means for securing said sleeve to the bar, a slide 7 mounted on the collar and provided with an operating-screw, a slide 10, carried by the slide 7, and movable at right angles to the latter, an operating-screw for the slide 10, and a finger 13, the stem of which is ad justably mounted in the slide 10,substantially as set forth.

5. In a reduction device, the combination with the slide 10, of the finger, its stem 12,

having a flattened face, the spring on the slide bearing on said face, and a set-collar on the straight edge and a notch 13*, substantially 1o stem above the slide to limit its movement, as set forth. substantially as set forth. In witness whereof I have hereunto signed 6. In a reduction device, the combination my name, this 19th day of October, 1899, in with the horizontal bar 1,the adjustable sleeve the presence of two subscribing witnesses.

thereon, and the horizontal slide 10 carried FERDINAND J. KALLENBACH. thereby, of the upright stem 12 slidably and Witnesses:

adjustably mounted in said bar, and the flat HENRY DISTLER, finger 13, on said stem and provided with a I ALFRED HODGES. 

